Adjustable arm for a desk lamp



FIG. 1 is a right side elevational view of an adjustable arm for a desk lamp showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The desk lamp head is shown in broken lines for illustrative purposes only. 

The ornamental design for a adjustable arm for a desk lamp, as shown and described. 